SQLStore: Fix PostgreSQL failure to create organisation for first time (#21648)

* Fix PostgreSQL failure to create organisation for first time

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/services/sqlstore/migrator/postgres_dialect.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/go-xorm/xorm"
+	"github.com/grafana/grafana/pkg/util/errutil"
 	"github.com/lib/pq"
 )
 
@@ -155,3 +156,15 @@ func (db *Postgres) IsUniqueConstraintViolation(err error) bool {
 func (db *Postgres) IsDeadlock(err error) bool {
 	return db.isThisError(err, "40P01")
 }
+
+func (db *Postgres) PostInsertId(table string, sess *xorm.Session) error {
+	if table != "org" {
+		return nil
+	}
+
+	// sync primary key sequence of org table
+	if _, err := sess.Exec("SELECT setval('org_id_seq', (SELECT max(id) FROM org));"); err != nil {
+		return errutil.Wrapf(err, "failed to sync primary key for org table")
+	}
+	return nil
+}